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Polyacrylonitrile membrane with supporting materials and preparation method thereof

A technology of polyacrylonitrile membrane and support material is applied in the field of composite materials, which can solve the problem of low mechanical strength, and achieve the effect of increasing the membrane area, reducing the volume of filtering equipment and reducing the volume.

Inactive Publication Date: 2012-03-28
ZHEJIANG CREATION ENVIRONMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanical strength of polyacrylonitrile ultrafiltration membrane is not high. Therefore, the preparation of polyacrylonitrile hollow fiber membrane with high strength and good hydrophilicity has important theoretical and practical significance.

Method used

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  • Polyacrylonitrile membrane with supporting materials and preparation method thereof
  • Polyacrylonitrile membrane with supporting materials and preparation method thereof
  • Polyacrylonitrile membrane with supporting materials and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0020] The steps of the preparation method of the polyacrylonitrile membrane with supporting material are as follows:

[0021] 1) PAN with a concentration of 12-20 wt / v %, oxidant with a concentration of 4.5-6.5 wt / v %, pore-forming agent with a concentration of 5 wt / v %, and solvent with a concentration of 65-89 wt / v % were added to the solution in sequence. In the material kettle, open the sealing bar of the stirring shaft of the material melting kettle, stir and mix evenly at 55-70°C, remove air bubbles, and obtain the casting film liquid;

[0022] 2) Squeeze the casting liquid into the tubular hollow fiber spinning spinneret, the temperature of the casting liquid is 35-40°C, the core liquid is ultrafiltration water, the core liquid temperature is 18-25°C, the room temperature is 18-25°C, and the indoor humidity 6-70%, at the spinning speed of 15-60m / min, the casting solution is extruded by air pressure, filtered through the filter and metering pump into the spinneret casti...

Embodiment 1

[0025] 1) PAN at a concentration of 12 wt / v %, calcium nitrate at a concentration of 4.5 wt / v %, polyethylene glycol at a concentration of 5 wt / v %, N,N-dimethylethylene at a concentration of 65 wt / v % The amides are sequentially added to the melting pot, and the stirring shaft of the melting pot is opened to seal the pressure bar. At 55°C, stir and mix evenly, remove air bubbles, and obtain a casting solution;

[0026] 2) Squeeze the casting liquid into the tubular hollow fiber spinning spinneret, the temperature of the casting liquid is 35°C, the core liquid is ultra-filtered water, the temperature of the core liquid is 18°C, the room temperature is 18°C, the indoor humidity is 6%, at 15m / At the spinning speed of min, the casting solution is extruded by air pressure, filtered through the filter screen and metering pump into the inlet hole of the spinneret casting solution, and the monofilament fiber and the core that enter the spinneret from the monofilament fiber inlet hole...

Embodiment 2

[0029] 1) 20 wt / v % PAN, 6.5 wt / v % nitric acid, 5 wt / v % polyvinylpyrrolidone, 89 wt / v % N,N-dimethylformamide Sequentially add to the melting material kettle, open the stirring shaft sealing pressure bar of the melting material kettle, stir and mix evenly at 70°C, remove air bubbles, and obtain the casting film liquid;

[0030] 2) Squeeze the casting liquid into the tubular hollow fiber spinning spinneret. The temperature of the casting liquid is 40°C, the core liquid is ultra-filtered water, the temperature of the core liquid is 25°C, the room temperature is 25°C, and the indoor humidity is 70%. At the spinning speed of min, the casting solution is extruded by air pressure, filtered through the filter screen and metering pump into the inlet hole of the spinneret casting solution, and the monofilament fiber and the core that enter the spinneret from the monofilament fiber inlet hole The deionized water that enters the hole enters the coagulation bath after the composite mold...

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Abstract

The invention discloses a polyacrylonitrile membrane with supporting materials and a preparation method thereof. The preparation method is characterized by comprising the following steps: taking calcium nitrate or lithium nitrate as an oxidant, polyethylene glycol or polyvinylpyrrolidone as a pore-forming agent and one or two of N,N-dimethylacetamide and N,N-dimethylformamide to prepare a polyacrylonitrile hollow fibrous membrane by a dry-wet method, ensuring monofilaments to enter into a spinneret via other inlets and carrying out blending to prepare the polyacrylonitrile hollow fibrous composite membrane with the supporting materials, wherein the monofilament fibrous materials are polyester, spandex, nylon 6, nylon 66 or polyurethane and have diameter of 0.01-2mm. The membrane and the preparation method have the following beneficial effects: the defect that the hollow fibrous membranes without supports have insufficient physical tensile strength and are easy to suffer from filament break is overcome; the physical tensile strength of the membrane disclosed by the invention is improved by more than several times compared with that of the hollow fibrous membranes without supports; support and membrane stripping can be avoided; the water flux and manufacturing cost of the membrane disclosed by the invention are equivalent to the water flux and manufacturing cost of the hollow fibers without supports; and the membrane can replace the existing hollow fiber products and has great economic and social benefits.

Description

technical field [0001] The invention relates to a composite material, in particular to a polyacrylonitrile membrane with a supporting material and a preparation method thereof. Background technique [0002] Ultrafiltration is a membrane process between microfiltration and nanofiltration. It is mainly used to separate macromolecules, colloids and particles in a solution, and has the characteristics of high efficiency and low energy consumption. In recent years, with the continuous development of membrane materials and membrane technology, ultrafiltration technology has become an indispensable and important operation hope in the nap treatment. Membrane material and performance are important factors affecting its application. In order to achieve high separation efficiency and realize the selective removal of substances in water, developing new membrane materials or researching new membrane material preparation processes is one of the priorities of water treatment workers today....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/10B01D71/42B01D67/00
Inventor 包进峰张星星李芸芳赵辉杨佳
Owner ZHEJIANG CREATION ENVIRONMENT TECH
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